{
  "family": "pirminay",
  "sample_count": 13,
  "category": "infostealer",
  "description": "Pirminay (classified across security vendors as Trojan:Win32/Pirminay and PWS:Win32/Pirminay) is an information-stealing trojan designed to covertly harvest system credentials, cached passwords, and sensitive browser session tokens from Windows hosts. Distributed via spear-phishing emails containing malicious invoice attachments or weaponized macro documents, Pirminay executes environment discovery upon launch. It scrapes stored credentials from major web browsers (Chrome, Firefox, Edge), email clients (Outlook, Thunderbird), and Windows Credential Manager. It encrypts collected data with AES/XOR and exfiltrates it to remote command-and-control servers over HTTP/HTTPS POST requests.",
  "cta": "Published by the SystemHelpdesk Threat Intelligence Team.",
  "aliases": [
    "Trojan:Win32/Pirminay",
    "PWS:Win32/Pirminay",
    "Trojan-PSW.Win32.Pirminay",
    "Pirminay Stealer",
    "Win32/Pirminay"
  ],
  "enrichment_level": "curated_sourced",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Trojan:Win32/Pirminay?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pirminay is an infostealer trojan that harvests saved credentials from web browsers, email clients, and Windows vaults."
      }
    },
    {
      "@type": "Question",
      "name": "How does Pirminay extract browser passwords?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It queries SQLite databases in user AppData directories, decrypting DPAPI-protected master keys to obtain plaintext passwords."
      }
    },
    {
      "@type": "Question",
      "name": "How does Pirminay exfiltrate stolen information?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "It compresses credentials into encrypted archives and transmits them via HTTP/HTTPS POST requests to remote C2 servers."
      }
    },
    {
      "@type": "Question",
      "name": "How is Pirminay distributed to victims?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Via spear-phishing emails containing malicious documents, disguised software installers, and weaponized script loaders."
      }
    },
    {
      "@type": "Question",
      "name": "What remediation steps should be taken against Pirminay?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Isolate the infected endpoint, terminate unauthorized processes, remove registry autoruns, and immediately reset all exposed passwords."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1555.003",
    "T1555.004",
    "T1547.001",
    "T1059.003",
    "T1041",
    "T1071.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-10-15",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise",
      "tactic": "Initial Access"
    },
    {
      "id": "T1176",
      "name": "Browser Extensions",
      "tactic": "Persistence"
    },
    {
      "id": "T1112",
      "name": "Modify Registry",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer",
      "tactic": "Command and Control"
    }
  ],
  "containment_steps": [
    "Quarantine the endpoint to halt the active exfiltration of browsing telemetry and the downloading of further adware modules.",
    "Audit Windows Group Policies and the Registry to remove any forced extension installation policies created by the adware.",
    "Deploy an enterprise adware removal tool (e.g., AdwCleaner) to locate and strip the deeply embedded registry hooks and watchdog services.",
    "Force a complete reset of all installed web browsers to factory defaults to eradicate the rogue extensions and restore the homepage."
  ],
  "what_to_avoid": [
    "Do not rely solely on the browser's 'remove extension' button; Pirminay frequently uses GPOs and watchdog services to immediately reinstall itself.",
    "Avoid ignoring the infection; adware tracking data is highly detailed and may expose corporate activities or access to internal portals."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "sources": [
    {
      "name": "Microsoft Defender Threat Encyclopedia - Trojan:Win32/Pirminay",
      "url": "https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Trojan:Win32/Pirminay"
    },
    {
      "name": "Trend Micro Security Research - PWS.Win32.Pirminay Overview",
      "url": "https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/pws.win32.pirminay"
    },
    {
      "name": "MITRE ATT&CK - Credentials from Password Stores (T1555)",
      "url": "https://attack.mitre.org/techniques/T1555/"
    }
  ],
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}